Self-tightening rock-drill chuck.



J. A. THOMPSON, E. M. MAGKIE & P. F. DOYLE.

SELF TIGHTENING BOGK DBILL CHUCK.

APPLICATION FILED JAN. 21, I907.

Patented May 4; 1909.

3 SHEETS-SHEET 1.

anvcntom. a. 7

Patented May 4, 1909. 3SHEETS-SHEB 2 J. A. THOMPSON, E. M. MAOKIE & P. 'P. DOYLE.

Patented May 4, 1909.

3 SHEETS-SHEET 3.

UNITED STATES PATENT OFFICE.

JAMES A. THOMPSON, Epwm M. MACKIE, AND PERCIVAL r. DoYLEfoF CHIOAGOf'ILLINOIS, ASSIGNORS T0 CHICAGOKPNEUIVIATIG TOOL COMPANY, A CORPORATION or new JERSEY.

SELF-TIGHTENING ROCK-DRILL CHUCK.

Patented May 4, 1909.

Application fiIedJanuary 21, 1907. Serial No. 353,282.

I '0 all whom it may concern: 7 Be it known that we, JAMES A. THOMPSON and EDWIN M. MAoKIE, citizens of the tion of a self tightening rock-drill chuck,

consisting of an improved construction of chuck body and chuck bushing, drill steel, chuck key, keying ring and spring clip'stop and their adjuncts constructed and assembled in a novel manner, whereby a labor and. time savin device is produced which will secure and hold the drill steel in the drillchuck under all conditions,irrespective of all working conditions to which the device may be subjected.

' For the purpose of illustrating our invention, we have shown different forms of devices, as these embodiments best illustrate the principle of our invention, although it is obvious that the principal instrumentalities of which our invention consists, can be variously arranged and organized, and in the accompanying drawings we have shown embodiments thereof which we have found in practice to give satisfactory results, although it is to be understood that our invention is not limited to the specific arrangement and organization of these instrumentalities, as herein shown;

To the above ends, our invention consists broadly of anovel construction of self-tightenin rock-drill chuck, whose novelfeatures -will e hereinafter fully set forth and pointed out in the claims.

Figure 1 represents a side elevation of a self-tightening rock-drill chuck embodying our invention. Fig. 2 represents a sectional view of our novel chuck, the section being taken on line a:a;; of Fig. 3. Fig. 3 represents a section on line yg Fig. 2. Fig. t represents a sectional view of our novel bushing in detached position. Fig. 5 represents a side elevation of another embodiment of our invention. Fig. 6 represents a sectional view of Fig. 5.

Similar numerals of referenceindicate corresponding parts in the figures.

Referring to the drawin s:' As seen Fig. 1, 1 designates the chuc body which is and chuck-red 1 froni'themachine, becaul s" I slip 9, thelireying ring 8 can then he slipped off the chuck 1, the

composed of suitable material and constructed to suitably fit and receive the other component parts.

2 designates a renewable hardened steel bushing which is relieved by recessing its inner surface-as indicated. at. 10, so as to provide suitable bearings 11 and 12 at each end for the drill steel 3, it being apparent that the outer diameter of the bushing 2 is made sufficiently large, to allow said bushing to be pressed tightly into the seat provided for it in the chuck body 1. To facilitate the removal of the bushing when worn, it is provided with longitudinal grooves 4 on its outer surface, which extend outwardly at each end from the chuck key slot 13 provided for the chuck key'5, it bein apparent that tome move the chuck bus irng;v 2, the drill'steel, chuck key and keying ring being-first removed, a suitable drift is driven in the opening or groove 4 to break the thin walls 6; of the chuck bushing, whereupon b breaking in said walls 6, said chuck bushing will be loosened in the chuck and easily removed, whereupon a new bushing can be readil pressed in 'or placed in position. The chuc key 5 is made to fit end-wise in the chuck slot 14 therefor and its inner face 15 is slightly concaved or made to fit the contour of the drill steel 3, as will be agparent fromFi'g. 3,

and the bearing of sai chuck key on said drill steel 3 is also relieved as indicated at 16 and being opposite to the relieved lpart 10 of the chuck bushing 2 ,provides an 'e astic grip when the device is keyed up, as will be, 6V1; dent to those skilledin the art." I

The upper face of thechuck key bis-constructedwith a liberal bearing areaand is suitably tapered lengthwise to fit the conti uous tapering slot 17 in the ke ing ring 8, which is made of suitable material and bored out to suitably fit ,the'outersurfac'e of the chuck rod 1 and is also provided with a tapering slot to fit the contlguous chuck-kc 5. h

To prevent the keyingri ng' 8 from slipping, off the chuck 1, when the chuck-key 5"has been removed, a spring clip sto 9 is provided 1 which has another important fjiinctioirfsince it will be apparent that in it should be; f

come necessary to remove the kyingfiingi for repairs or to replace itwith anew one VVlll not be necessary toremove'the pist by forcing off the sprin chuck-key 5 having been removed and a new ring S-ca'n then be slipped on the chuck and the resilient ring 9 again readily sprung in place without necessitating dismantling or sto ing of the drill to any extent.

'l d e operation of this embodiment of our invention will be ap arent to those skilled in the art, since it w be seen that it is only necessa for the operator to slip the keying ring 8 a ong the chuck 1 toward the'drill until the chuck-key 5 is free enough to allow the shank of the drill steel 3 to be slipped into place in the chuck bushing 2, after which the key '5 is pressed against the drill steel; shank and then the keying ring 8 is ey 5.

oushed tightly into position upon said It will thus be seen that this will hold the drill steel in its place in the chuck until the machine is made to strike a blow, whereupon the momentum of the keying ring 8 will force it more tightly on the taperin chuck key 5 and each'succceding blow will old the grip, as is evident.

' In the embodiments seen in Figs. 5 and 6 7 we have shown a self-tightening rock-drill chuck in which a slightly modified form of bushing is employed and in this embodiment 18 designates the chuck body which is simiiar to the construction shownin Figs. 1 to 3 inclusive. 19 designates a renewable -hardened steel bushing which is relieved by recessing its inner surface at 20'so as to form bearin s21 and 22 at each end with which the dril steel 23 engages- In this embodiment instead of employing the longitudinally extending grooves, such as 4, as indicated in Figs. 1, 2 and 4, we weaken the bushings b a'plurality of radiall drilled holes 24 at each end, as will be read' y apparent from Figs. 5 and 61 The chuck key 25 fits into the chuck slot 26 and slot 27 in the bushing 19, it being understood that the inner face of the chuck ey 25-is slightly rounded in a manner similar to that alreadv described withreference to Figs. 1 to 3 inc usive. of the chuck key 25 is relieved as indicated at 28, the-opposite portion 20 of the bushing 19 thus providing an elastic grip when the device is assembled. 29 designates a keying ring which is slotted or recessed as at 30 in order that improper lateral movement of the parts when in assembled position will be prevented, it being understood that this slot 30 is tapered in order that when the machine is made'to strikea blow the momentum of the keying ring '29 will force it more tightly on the tapered chuck key 25and each succeed- .ing blow 'will hold the grip in precisely the same manner as before described with refer.- ence to Flgs. 1 to 3 Inclusive. 31 designates the spring clip. Since this embodiment differs from the embodiment seen in Figs. 1. to 4,

inclusive, only in the construction of the.

chuck bushin we have deemed it unnecessary to descrl e in detail the manner of as- The inner face sembl-ing the parts, since it will be similar to that before described. When it is necessar to remove the bushing the same may be rea ily accomplished by cutting away the walls 32 of the radially disposed a ertures 24 by the employment of a suitable c isel or equivalent device.

It will be a parent that the tapering surfaces on the liby and the slot of the keying ring are made so as to give sufficient wedge also allow the keying ring 8 to be easily unsuitable set hammer bein in practice, provided to hold against the eying ring to prevent its being injured in unke ing' It will thus be apparent to those-'sk'il ed in the art that by our novel construction and manner of assembling the drill steel 3, chuck-bushing 2, chuck-key 5 and keyin" ring 8, that we have provided a labor and time savi-n dein the drill chuck under all conditions, in a positive and effective manner, no matter how hardthe service may be to which the drill is ut.

It wi 1 be further apparent to those skilled in the art that by reason of our novel construction of bushing 2, having the recessed portion 10, correlated and co-acting with the chuck key slot 13 having the key 5 assembled as shown, with the relieved portion 16 thereof, combined with the means as 8 for retaining these parts in assembled position for thus automatically creasing the strength of the grip, we have produced a simple, cheap and effective device wherein the necessary amount of elasticity to produce the. most efficient results is present, as will e apparent to those skilled in the art. Y

It will also be ap )arent that slight changes may be made by tiose skilled in the art in the manner of assembling and constructing the co-acting and we do not, therefore, desire to be limited in every instance to the exact construction ,we have herein shown and described.

we claim as new and desire ters Patent, is

1. In a device of the character stated, the combination of a chuck body, a drillsteel, a bushing therefor having an inner relieved portion intermediate its ends, and a slot-opposite said relieved portion, a chuck key 111 said slot having an lnclined top, and means engaging said chuck body and chuck key for I retaining the parts in assembledcondition.

2. In a device of the characterstat-ed, the combination .of a chuck bodyga drill steel, a bushing therefor, having weakened ends, an inner relieved portion intermediate its ends, and a slotopposite said relieved portion, a I chuck key in said slot having an inclined top, and means engaging said chuck bodyand to secure by Let- 'actlon to securely hold the drill steel 3 and to jkeyed by striking it a blow on its large'end, a

vice which will secure and hold the drill steel Having thus described our inventiomwhat.

parts comprising ourinvention' chuck key for retaining the parts in assembled condition.

3. In a device of'the character stated, the combination of a chuck body, a drill steel, a

- bushing therefor, having an inner relieved portion intermediate its ends, and a slot opposite said relieved portion, a chuck key in said slot having an inclined top, means engaging said chuckbody and chuck key for retaining the parts inassembled condition, and a resilient member for limiting the forward movement of said means.

4. In a deviceof the character stated, the combination of a chuck body, a drill steel, a bushing therefor, having an inner relieved portion intermediate its ends, and a slot opposite said relieved portion, a chuck key in said slot having an inclined top, and a keying ring engaging said chuck body and chuck key for retaining the parts in assembled condition.

5. In a device of the character stated, the combination of-a chuck body, a drill steel, a bushing therefor, having'an inner relieved portion intermediate its ends, and a slot opposite said relieved portion, a chuck key in said slot having an inclined top, and a keying ring engaging said chuck body and chuck key for retaining the parts in assembled condition, said ring having an inclined slot with which the inclined top of said key coacts.

6, In a device of the character stated, the combination of a'chuck body, a drill steel, a bushing therefor, having an inner relieved portion intermediate its ends, and a slot opposite said relieved portion, a chuck key in said slot having an'inclined top, akeying ring engaging said chuck body and chuck key-for retaining the parts inassembled con dition, said rin having an inclined slot with which the inehned top of said key coacts, and a spring clip carried by said chuck body for limiting the movement of said ring.

7. In a self tightening rock drill chuck, the combination of a chuck body, a chuck-bushing therefor having an inner relieved portion intermediate its ends, a drill steel contained within said chuck-bushing, a chuck-key, and a keying ring surroundin said chuck-key and adapted to retain the Iatter in position.

8. In a self tight rung rock drill chuck, the combination of a chuck body, a bushing therefor, the inner surface of which is relieved to, form bearings, a drill steel containedwithin said bushing and. engaging said bearings, a key adapted to bear on said drill steel opposite the relieved inner surface of said bushing, and a keying ring surrounding said chuck body and engaging said key to retain the parts in assembled condition.-

9. In a self-tightening rock-drill chuck, the I combination of a chuck body, a bushing therefor, the inner surface of Whichis relieved to form bearings, a drill steel contained Within said bushing and engaging said bearings, a key having its inner face relieved intermediate its ends and adapted tov bear on said drill steel opposite the relieved inner surface of said bushing, and a keying ring surrounding said chuck body and engaging said key to retain the parts in assembled condition.

JAMES A. THOMPSON. EDWIN M MACKIE. PERCIVAL F. DOYLE. Witnesses ELMA A. KENEL, THOMAS RoLLAND. 

